The metallographic examination of pure iron is a crucial testing item for evaluating the performance of metallic materials and assessing grain quality. It is widely applied in fields such as mechanical manufacturing, new material research, and industrial quality control of incoming materials. Accurate metallographic examination results rely on a standardized complete sample preparation process and compliant and stable metallographic sample preparation equipment.

This article presents a practical test case of the full set of metallographic equipment from Chongqing Wanwei Instrument. It comprehensively documents the standardized full process of pure iron sample preparation, from cutting, mounting, grinding and polishing, etching, microscopic observation, to intelligent grain size grading and automatic generation of test reports. It visually demonstrates the sample preparation effect and testing accuracy of national standard metallographic equipment.

1. Metallographic precision cutting: Obtaining standard initial test samples

Place the pure iron sample in the metallographic precision cutting machine, ensuring standardized clamping and fixation to eliminate issues such as cutting vibration and section deformation. Cut smoothly to obtain a small sample with a flat section and compliant dimensions, laying a solid foundation for subsequent inlaying and grinding processes.

2. Fully automatic hot mounting: preparation of standard test sample blocks

For irregular pure iron samples after cutting, place them into a fully automatic metallographic mounting machine, add specialized mounting materials, and initiate the fully automatic hot pressing mounting process. The equipment precisely controls temperature and pressure, solidifying the irregular samples into standard-sized specimen blocks. This solves the problem of small, irregular samples being difficult to grind and prone to chipping, ensuring the integrity of sample preparation.

3. Fully automatic grinding and polishing: preparing mirror-like undamaged samples

Place the embedded standard sample into the fully automatic metallographic grinding and polishing machine to complete the integrated processing of rough grinding, fine grinding, and fine polishing. This process thoroughly removes scratches and damaged layers on the sample surface, ultimately achieving a flat, bright, and deformation-free mirror-like effect that meets the standard requirements for metallographic microscopy observation.

4. Corrosion treatment: reveal the metallographic structure

On the polished surface of the mirror sample, a special etchant for pure iron is dripped, and the etching time is precisely controlled to clearly reveal the internal grain boundaries and metallographic structure morphology of pure iron, providing qualified sample conditions for microscopic observation and grain analysis.

5. Microscopic observation + intelligent grading + automatic report generation

Place the prepared sample under the Chongqing Wanwei metallographic microscope, select and match the appropriate objective lens, and the complete metallographic structure of pure iron can be clearly observed. Relying on professional metallographic analysis software, it automatically captures grain characteristics, identifies microstructure morphology, and completes intelligent grading of grain size. The system can automatically generate standardized test reports, detailing core data such as grain size, grain distribution, and microstructure state. The data is traceable, and the results meet the national standard testing requirements.

Case Summary

The entire process of this pure iron metallographic testing utilizes the full set of metallographic equipment from Chongqing Wanwei, ensuring standardized sample preparation, high consistency of finished products, and precise and stable testing data. It can meet various metallographic testing needs for metals in corporate quality inspection, university research, and third-party testing institutions.

If you need to purchase a full set of metallographic equipment and set up a standardized metallographic laboratory, please contact Chongqing Wanwei Instrument to develop a customized metallographic sample preparation and testing solution for you.